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/*
* RTP/mpegts muxer
* Copyright (c) 2011 Martin Storsjo
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/mathematics.h"
#include "avformat.h"
struct MuxChain {
AVFormatContext *mpegts_ctx;
AVFormatContext *rtp_ctx;
};
static int rtp_mpegts_write_close(AVFormatContext *s)
{
struct MuxChain *chain = s->priv_data;
if (chain->mpegts_ctx) {
av_write_trailer(chain->mpegts_ctx);
if (chain->mpegts_ctx->pb) {
uint8_t *buf;
avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
av_free(buf);
}
avformat_free_context(chain->mpegts_ctx);
}
if (chain->rtp_ctx) {
av_write_trailer(chain->rtp_ctx);
avformat_free_context(chain->rtp_ctx);
}
return 0;
}
static int rtp_mpegts_write_header(AVFormatContext *s)
{
struct MuxChain *chain = s->priv_data;
AVFormatContext *mpegts_ctx = NULL, *rtp_ctx = NULL;
AVOutputFormat *mpegts_format = av_guess_format("mpegts", NULL, NULL);
AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
int i, ret = AVERROR(ENOMEM);
AVStream *st;
if (!mpegts_format || !rtp_format)
return AVERROR(ENOSYS);
mpegts_ctx = avformat_alloc_context();
if (!mpegts_ctx)
return AVERROR(ENOMEM);
mpegts_ctx->oformat = mpegts_format;
mpegts_ctx->max_delay = s->max_delay;
for (i = 0; i < s->nb_streams; i++) {
AVStream* st = avformat_new_stream(mpegts_ctx, NULL);
if (!st)
goto fail;
st->time_base = s->streams[i]->time_base;
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
avcodec_copy_context(st->codec, s->streams[i]->codec);
}
if ((ret = avio_open_dyn_buf(&mpegts_ctx->pb)) < 0)
goto fail;
if ((ret = avformat_write_header(mpegts_ctx, NULL)) < 0)
goto fail;
for (i = 0; i < s->nb_streams; i++)
s->streams[i]->time_base = mpegts_ctx->streams[i]->time_base;
chain->mpegts_ctx = mpegts_ctx;
mpegts_ctx = NULL;
rtp_ctx = avformat_alloc_context();
if (!rtp_ctx) {
ret = AVERROR(ENOMEM);
goto fail;
}
rtp_ctx->oformat = rtp_format;
st = avformat_new_stream(rtp_ctx, NULL);
st->time_base.num = 1;
st->time_base.den = 90000;
st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
chain->rtp_ctx = rtp_ctx;
rtp_ctx->pb = s->pb;
if ((ret = avformat_write_header(rtp_ctx, NULL)) < 0)
goto fail;
rtp_ctx = NULL;
return 0;
fail:
if (mpegts_ctx) {
if (mpegts_ctx->pb) {
uint8_t *buf;
avio_close_dyn_buf(mpegts_ctx->pb, &buf);
av_free(buf);
}
avformat_free_context(mpegts_ctx);
}
if (rtp_ctx)
avformat_free_context(rtp_ctx);
rtp_mpegts_write_close(s);
return ret;
}
static int rtp_mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
struct MuxChain *chain = s->priv_data;
int ret = 0, size;
uint8_t *buf;
AVPacket local_pkt;
if (!chain->mpegts_ctx->pb) {
if ((ret = avio_open_dyn_buf(&chain->mpegts_ctx->pb)) < 0)
return ret;
}
if ((ret = av_write_frame(chain->mpegts_ctx, pkt)) < 0)
return ret;
size = avio_close_dyn_buf(chain->mpegts_ctx->pb, &buf);
chain->mpegts_ctx->pb = NULL;
if (size == 0) {
av_free(buf);
return 0;
}
av_init_packet(&local_pkt);
local_pkt.data = buf;
local_pkt.size = size;
local_pkt.stream_index = 0;
if (pkt->pts != AV_NOPTS_VALUE)
local_pkt.pts = av_rescale_q(pkt->pts,
s->streams[pkt->stream_index]->time_base,
chain->rtp_ctx->streams[0]->time_base);
if (pkt->dts != AV_NOPTS_VALUE)
local_pkt.dts = av_rescale_q(pkt->dts,
s->streams[pkt->stream_index]->time_base,
chain->rtp_ctx->streams[0]->time_base);
ret = av_write_frame(chain->rtp_ctx, &local_pkt);
av_free(buf);
return ret;
}
AVOutputFormat ff_rtp_mpegts_muxer = {
.name = "rtp_mpegts",
.long_name = NULL_IF_CONFIG_SMALL("RTP/mpegts output format"),
.priv_data_size = sizeof(struct MuxChain),
.audio_codec = AV_CODEC_ID_AAC,
.video_codec = AV_CODEC_ID_MPEG4,
.write_header = rtp_mpegts_write_header,
.write_packet = rtp_mpegts_write_packet,
.write_trailer = rtp_mpegts_write_close,
};
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